This could be a lucrative space, especially in the enterprise. While the field is a bit crowded, I think Insoshi differentiates themselves by providing the source code, and for secure intranets that is a necessity.
Here's the problem I have with Insoshi and Loved By Less: They don't seem (as yet) to offer any kind of architecture to modify and extend the code base. If you want to customize, you are altering source code.
Contrast this to Wordpress, which has an awesome plugin architecture and an extensive system of hooks to allow for customization, all without touching a line of source. Though I haven't seen BuddyPress source, I am hopeful that it follows Wordpress's suits.
It is the ability to customize and extend, coupled with a super powerful and slick admin system, that has made WordPress such a successful venture.
That's my opinion at least, from an admittedly cursory review of the source code on these projects.
That's part of the plan. Remember, WordPress wasn't born with plugins and hooks; it grew them.
"Release early, release often", right? This is the "early" part. :-)